US10462379B2 - Driving method for high dynamic range display screen, driving apparatus and display screen - Google Patents
Driving method for high dynamic range display screen, driving apparatus and display screen Download PDFInfo
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- US10462379B2 US10462379B2 US15/548,863 US201715548863A US10462379B2 US 10462379 B2 US10462379 B2 US 10462379B2 US 201715548863 A US201715548863 A US 201715548863A US 10462379 B2 US10462379 B2 US 10462379B2
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000015654 memory Effects 0.000 description 12
- 230000006870 function Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 1
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- H04N5/2355—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G06T5/94—Dynamic range modification of images or parts thereof based on local image properties, e.g. for local contrast enhancement
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G09G2320/00—Control of display operating conditions
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- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Definitions
- Embodiments of the present disclosure relate to a driving method and a driving apparatus for a high dynamic range display screen, and a display screen.
- a backlight module in a liquid crystal display screen is a part with the highest energy consumption, and thus, by reducing power consumption of the backlight module, overall power consumption of the liquid crystal display screen can be greatly reduced.
- embodiments of the disclosure provide a driving method of a high dynamic range display screen, comprising: acquiring image data to be displayed; determining a local backlight brightness of each region in a backlight module according to the image data to be displayed; adjusting pixel brightness corresponding to the image data to be displayed according to the local backlight brightness and a maximum backlight bright in the backlight module; and carrying out display according to the adjusted brightness and the determined local backlight brightness of each region.
- the adjusting the brightness of the image data to be displayed according to the local backlight brightness and the maximum backlight brightness in the backlight module includes: determining original pixel brightness according to the image data to be displayed; and adjusting the original pixel brightness according to the local backlight brightness and the maximum backlight brightness in the backlight module.
- the adjusting the original pixel brightness according to the local backlight brightness and the maximum backlight brightness in the backlight module includes: adjusting the original pixel brightness by adopting a formula as follows:
- Y Y 0 + ( BL max - BL DB ) ⁇ Y 0 BL max ⁇ a , where Y0 is the original pixel brightness, Y is the adjusted pixel brightness, BLMAX is a maximum backlight brightness in the backlight module, BLDB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
- the BLDB is a local backlight brightness of the backlight module after dynamic adjustment.
- a value of the “a” parameter ranges from 1 ⁇ 8 to 1.
- the determined local backlight brightness in the backlight module is smaller.
- Embodiments of the disclosure further provide a driving apparatus of a high dynamic range display screen, comprising: a receiving unit, configured to acquire image data to be displayed; a backlight control unit, configured to determine a local backlight brightness of each region in a backlight module according to the image data to be displayed; a pixel compensation unit, configured to adjust brightness corresponding to the image data to be displayed according to the local backlight brightness and a maximum backlight brightness in the backlight module; and a display control unit, configured to carry out display according to the adjusted brightness and the determined local backlight brightness of each region.
- the pixel compensation unit is configured to: determine original pixel brightness according to the image data to be displayed; and adjust the original pixel brightness according to the local backlight brightness and the maximum backlight brightness in the backlight module.
- the pixel compensation unit is configured to adjust the original pixel brightness by adopting a formula as follows:
- Y Y 0 + ( BL max - BL DB ) ⁇ Y 0 BL max ⁇ a , where Y0 is the original pixel brightness, Y is the adjusted pixel brightness, BLMAX is the maximum backlight brightness in the backlight module, BLDB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
- the BLDB is a local backlight brightness of the backlight module after dynamic adjustment.
- a value of the “a” parameter ranges from 1 ⁇ 8 to 1.
- the determined local backlight brightness in the backlight module is smaller.
- Embodiments of the disclosure further provide a high dynamic range display screen, comprising a backlight module and the driving apparatus provided by any embodiment of the disclosure.
- FIG. 1 is a schematic diagram illustrating a relationship between an electro-optical conversion function curve after data compensation is carried out and an electro-optical conversion function curve when data compensation is not carried out when an existing approach is used;
- FIG. 2 is a flow chart of a driving method for a high dynamic range display screen provided by an embodiment of the present disclosure
- FIG. 3 is a schematic diagram illustrating a relationship between an electro-optical conversion function curve after data compensation is carried out and an electro-optical conversion function curve when data compensation is not carried out when an approach provided by an embodiment of the present disclosure is used;
- FIG. 4 is a schematic diagram of a driving apparatus for a high dynamic range display screen provided by an embodiment of the present disclosure
- FIG. 5 is a schematic diagram of a driving apparatus provided by an embodiment of the present disclosure.
- FIG. 6 is a schematic diagram of a high dynamic range display screen provided by an embodiment of the present disclosure.
- a backlight module adopting a direct-lit type Light-Emitting Diode (LED) backlight combined with a Local Dimming technology can greatly reduce power consumption of the backlight module, improve contrast and gray scale values of display images and reduce ghost shadow.
- LED Light-Emitting Diode
- the backlight module combined with the Local Dimming technology utilizes a backlight source including hundreds of LEDs to replace a Cold Cathode Fluorescent Lamp (CCFL) backlight.
- CCFL Cold Cathode Fluorescent Lamp
- Each LED constituting the backlight module can be adjusted according to brightness of an image.
- An LED corresponding to a high brightness portion in the display image can be adjusted to reach a maximum brightness, and meanwhile, an LED corresponding to a dark portion in the display image can be correspondingly reduced in brightness and even turned off so as to reach an optimal contrast. Therefore, in the backlight module, overall power consumption of the backlight module is reduced by reducing brightness of dark regions.
- pixel data may be compensated generally, and a formula as follows can be adopted to carry out the compensation:
- R DB R BL DB BL 22 , where BL is standard backlight brightness, BL DB is a local backlight brightness after dynamic adjustment, R is original pixel data, and R SB is pixel data after data compensation.
- BL standard backlight brightness
- BL DB a local backlight brightness after dynamic adjustment
- R original pixel data
- R SB pixel data after data compensation.
- a driving method for a high dynamic range display screen which is provided by an embodiment of the present disclosure, as shown in FIG. 2 , includes:
- the local backlight brightness of each region in the backlight module is determined according to the image data to be displayed (e.g., the brightness corresponding to the display image data). Then, the brightness of the image data to be displayed is adjusted according to the local backlight brightness and the maximum backlight brightness in the backlight module, so as to guarantee a minimum brightness value after adjustment (e.g., data compensation) to be relatively low and meet a contrast standard of the HDR display screen. Finally, display is carried out according to the adjusted brightness and the determined local backlight brightness of each region in the backlight module.
- the local dimming technology can be adopted to carry out adjustment on the local backlight brightness of each region in the backlight module.
- the step S 203 of adjusting the brightness of the image data to be displayed according to the local backlight brightness and the maximum backlight bright in the backlight module may be implemented in the following way:
- the original pixel brightness when the original pixel brightness is adjusted according to the local backlight brightness and the maximum backlight brightness in the backlight module, the original pixel brightness can be adjusted by adopting a formula as follows:
- Y Y 0 + ( BL max - BL DB ) ⁇ Y 0 BL max ⁇ a ;
- Y 0 is the original pixel brightness
- Y is the adjusted pixel brightness
- BL MAX is the maximum backlight brightness in the backlight module
- BL DB is the local backlight brightness of the backlight module
- “a” is an adjustable parameter.
- the BL DB is a local backlight brightness of the backlight module after dynamic adjustment.
- a value of the “a” parameter in the formula ranges from 1 ⁇ 8 to 1.
- an electro-optical conversion function curve 03 of the pixel brightness after adjustment is carried out by adopting the above formula has a relatively low minimum brightness, when comparing with the electro-optical conversion function curve 02 when data compensation is not carried out.
- the contrast standard of the HDR display screen can be satisfied.
- an embodiment of the present disclosure further provides a driving apparatus for a high dynamic range display screen.
- a problem-solving principle of the apparatus is similar with that of the above-mentioned driving method for the high dynamic range display screen, and thus, implementation of the apparatus can be achieved with reference to implementation of the method. Similar description will not be repeated here.
- the driving apparatus for the high dynamic range display screen which is provided by embodiments of the present disclosure, as shown in FIG. 4 , includes:
- a receiving unit 401 configured for acquiring image data to be displayed
- a backlight control unit 402 configured for determining a local backlight brightness of each region in a backlight module according to the image data to be displayed;
- a pixel compensation unit 403 configured for adjusting brightness of the image data to be displayed according to the local backlight brightness and the maximum backlight brightness in the backlight module;
- a display control unit 404 configured for carrying out display according to the adjusted brightness and the determined local backlight brightness of each region in the backlight module.
- the receiving unit 401 , the backlight control unit 402 , the pixel compensation unit 403 and the display control unit 404 may be implemented by a circuit (e.g., an integrated circuit).
- the pixel compensation unit 403 is configured for: determining original pixel brightness according to the image data to be displayed; and adjusting the original pixel brightness according to the local backlight brightness and the maximum backlight brightness in the backlight module.
- the pixel compensation unit 403 adopts a formula as follows to adjust the original pixel brightness:
- Y Y 0 + ( BL max - BL DB ) ⁇ Y 0 BL max ⁇ a , where Y 0 is the original pixel brightness, Y is the adjusted pixel brightness, BL MAX is the maximum backlight brightness of the backlight module, BL DB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
- the BL DB is a local backlight brightness of the backlight module after dynamic adjustment.
- a value of the “a” parameter in the pixel compensation unit 403 ranges from 1 ⁇ 8 to 1.
- the determined local backlight brightness in the backlight module is smaller.
- each unit e.g., the receiving unit 401 , the backlight control unit 402 , the pixel compensation unit 403 and the display control unit 404
- each unit in embodiments of the present disclosure can be implemented by hardware (e.g., in ways of the integrated circuit, a Field Programmable Gate Array (FPGA) and the like), and can also be implemented in a way of software plus a universal hardware platform.
- FPGA Field Programmable Gate Array
- the technical solutions of the embodiments of the present disclosure may be shown in a form of a software product, and the software product may be stored in a nonvolatile storage medium (which may be a Compact Disc Read-Only Memory (CD-ROM), a U disk, a mobile hard disk and the like), and includes a plurality of instructions for enabling a computer device (which may be a personal computer, a server, or a network device and the like) to execute the methods according to respective embodiments of the present disclosure.
- a nonvolatile storage medium which may be a Compact Disc Read-Only Memory (CD-ROM), a U disk, a mobile hard disk and the like
- CD-ROM Compact Disc Read-Only Memory
- the driving apparatus 200 can include a memory 210 and a processor 220 .
- the driving apparatus may include one or more processors and one or more memories.
- the memory 210 and the processor 220 can implement functions of respective units (e.g., the receiving unit 401 , the backlight control unit 402 , the pixel compensation unit 403 and the display control unit 404 ) in the driving apparatus 200 .
- respective units e.g., the receiving unit 401 , the backlight control unit 402 , the pixel compensation unit 403 and the display control unit 404 .
- the processor can process a data signal, and can include various computation structures, e.g., a Complex Instruction Set Computer (CISC) structure, a Reduced Instruction Set Computer (RISC) structure or a structure which implements combination of various instruction sets.
- the processor may also be a microprocessor, e.g., an X86 processor or an ARM processor, or may be a Digital Signal Processor (DSP) and the like.
- DSP Digital Signal Processor
- the memory can store instructions and/or data executed by the processor.
- the memory may include one or more computer program products, and each computer program product may include various forms of computer readable storage media, e.g., a volatile memory and/or a nonvolatile memory and the like.
- the volatile memory for example, may include a Random Access Memory (RAM) and/or a cache and the like.
- the nonvolatile memory for example, may include a Read Only Memory (ROM), a hard disk, a flash memory and the like.
- One or more computer program instructions may be stored on the computer readable storage medium, and the processor can operate the program instructions so as to achieve desired functions (which are achieved by the processor) in embodiments of the present disclosure which are mentioned above.
- Various applications and various data e.g., various data used and/or generated by the applications and the like, can also be stored in the computer readable storage medium.
- an embodiment of the present disclosure further provides a high dynamic range display screen 10 .
- the high dynamic range display screen includes a backlight module 100 and the driving apparatus 200 provided by any one embodiment of the present disclosure.
- modules in the apparatus in the embodiments may be distributed in the apparatuses in the embodiments according to description of the embodiments, and may also be correspondingly changed to be positioned in one or more apparatuses different from the embodiments.
- the modules of the embodiments may be combined into one module, and may also be further split into a plurality of sub-modules.
- the local backlight brightness of each region in the backlight module is determined according to the brightness of the image data to be displayed, and then the brightness of the image data to be displayed is adjusted according to the local backlight brightness and the maximum backlight brightness in the backlight module, so as to guarantee the minimum brightness value after data compensation is carried out to be relatively low and meet the contrast standard of the HDR display screen. Finally, display is carried out according to the adjusted brightness and the determined local backlight brightness.
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Abstract
Description
where Y0 is the original pixel brightness, Y is the adjusted pixel brightness, BLMAX is a maximum backlight brightness in the backlight module, BLDB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
where Y0 is the original pixel brightness, Y is the adjusted pixel brightness, BLMAX is the maximum backlight brightness in the backlight module, BLDB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
where BL is standard backlight brightness, BLDB is a local backlight brightness after dynamic adjustment, R is original pixel data, and RSB is pixel data after data compensation. As shown in
where Y0 is the original pixel brightness, Y is the adjusted pixel brightness, BLMAX is the maximum backlight brightness of the backlight module, BLDB is the local backlight brightness of the backlight module, and “a” is an adjustable parameter.
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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CN201610298897.XA CN105741789B (en) | 2016-05-06 | 2016-05-06 | A kind of driving method and driving device of high dynamic contrast display screen |
CN201610298897 | 2016-05-06 | ||
CN201610298897.X | 2016-05-06 | ||
PCT/CN2017/072986 WO2017190539A1 (en) | 2016-05-06 | 2017-02-06 | High dynamic contrast display screen driving method, driving device, and display screen |
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US10462379B2 true US10462379B2 (en) | 2019-10-29 |
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WO2017190539A1 (en) | 2017-11-09 |
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CN105741789A (en) | 2016-07-06 |
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